features: 1) American type coupling, German type coupling,British type coupling 2)material:aluminum/copper 3)diameter:1.5"-3" supply fire hose coupling according to your requirements 1. nominal diameter: 50-80mm2. working pressure3. type: American type coupling, German type coupling,British type coupling4. material : aluminum,brass5. size: 1",1.5",1.75",2",2.5",3"6.easy to operate fire hose ...